Manga with an OP male lead.?

seven deadly sin, mar, and fairy tail

Just about anything from the shonen category. Bleach if you don't mind filler, or watching the MC become OP.

One Punch Man (made the concept popular)

Dragon Ball (any of them, invented the concept)

My Hero Academia (super heroes)

Akashic Records of Bastard Magic Instructor (meant for teens, absurd fanservice, slacker MC)

Trigun (he could kill everyone, but but doesn't want to see anyone hurt, seen from the eyes of the insurance agents sent after MC)

Overlord (lawful evil protagonist done right, light novel, manga, webnovel, and 2 seasons of anime tells you how good it is, never hug a lich)

(Below are for adults)

Bastard (name says it all)

Berserk (MCs sword is called dragonslayer, and can cut regular people in half)

Fist of the North Star (organs everywhere levels of gore, insta-kill levels of strength from MC)

You might try Overlord. It's a series like SWO, in that the lead is trapped inside of a video game, but he was a max level character within the game with end-game gear and a small army of OP NPCs at his command when he became "stuck".

Some other series...

Fist of the North Star: Guy punches people... they explode to death.

Fist of the Blue Sky: Guy punches people... they explode to death. He has a smoking habit.

Helsing: Immortal vampire lets people shoot him up just so the fights aren't too boring.

Seven Deadly Sins: Everyone is OP.

Dragon Ball Z: Basically the definition of series w/ an over-powered main character.

One Piece: Luffy spends the first few arcs only being defeated by his own stupidy. Is basically a monster that eats monsters in a land of monsters.

Berserk: Guts is a one-man tank... until **** gets real at least.

Death Note: Light kills everyone who's name he can spell... that's pretty OP.

You mean an over-powered male lead?

Look no further than Sword Art Online.